The GCD of given numbers is 1.
| factors of 4 are : | 1 , 2 , 4 |
| factors of 11 are : | 1 , 11 |
| factors of 23 are : | 1 , 23 |
| factors of 33 are : | 1 , 3 , 11 , 33 |
| factors of 49 are : | 1 , 7 , 49 |
| factors of 23 are : | 1 , 23 |
We see that the Greatest Common Factor = 1.